https://en.m.wikipedia.org/wiki/Denn%C5%8D_Senshi_Porygon
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The episode is infamous for certain repetitive visual effects which inducedphotosensitive epileptic seizures in a substantial number of Japanese viewers, an incident referred to as the “Pokémon Shock” (ポケモンショック Pokemon Shokku?) by the Japanese press. 685 viewers were taken to hospitals; two people remained hospitalized for more than two weeks. Due to this, the episode has not been rebroadcast worldwide. After the incident, the Pokémon anime went into a four-month hiatus, and it returned on TV Tokyo in April 16, 1998, thus making the episode perhaps the most controversial episode of the entire Pokémon series. Since then, the episode has been parodied and referenced in cultural media, including The Simpsons and South Park.
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